On Mon, Feb 7, 2011 at 5:31 PM, Jan-Peter Homann <span dir="ltr"><<a href="mailto:homann@colormanagement.de">homann@colormanagement.de</a>></span> wrote:<br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div bgcolor="#ffffff" text="#000000">But we still should consider, that the described workflow has some
critical points.<br>
If all parts of the PDF should be converted to the profile of the
printer setting by embedding this profile as Output Intent into the
PDF file, it is mandatory, that every PDF-object is a ICCbasedRGB or
ICCbasedCMYK object.<br></div></blockquote><div><br></div><div>OutputIntent doesn't convert anything. It serves two purposes in PDF/X, PDF/A and PDF/E - and NO PURPOSE in a standard PDF (since the spec says it should be ignored). The two uses are:</div>
<div>- Destination Profile for the target device (should you need to retarget)</div><div>- Source Profile for any DeviceXXX colored object(s)</div><div><br></div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div bgcolor="#ffffff" text="#000000">
If a PDF file contains DeviceRGB or DeviceCMYK objects, ColorSync
will change such PDF objects automatically and without warning to
ICCbased mainly by embedding e.g. the ColorSync standard profiles in
every PDF object (images, vector graphics, text...)<br>
<br></div></blockquote><div><br></div><div>Apple/Quartz/ColorSync doesn't change anything UNLESS you explicitly ask it to. What it does, however, is ensure that all objects are tagged with profiles (with explicitly or implicitly) - which is EXACTLY what PDF/X-3, PDF/X-4, PDF/A and PDF/E do...</div>
<div><br></div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div bgcolor="#ffffff" text="#000000">Because of this, graphic art users under Mac OSX avoid the Mac OSX
function "Save as PDF" from the Apple printing dialogue.<br>
<br></div></blockquote><div><br></div><div>Doing a "Save as PDF" does _NOT_ run stuff through ColorSync UNLESS the user has turned on that option (a VERY unusual case!)</div><div><br></div><div>Leonard </div>
</div>